1 /* 2 * acpi_ac.c - ACPI AC Adapter Driver ($Revision: 27 $) 3 * 4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 6 * 7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or (at 12 * your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, but 15 * WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 * General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License along 20 * with this program; if not, write to the Free Software Foundation, Inc., 21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 22 * 23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 24 */ 25 26 #include <linux/kernel.h> 27 #include <linux/module.h> 28 #include <linux/init.h> 29 #include <linux/types.h> 30 #ifdef CONFIG_ACPI_PROCFS_POWER 31 #include <linux/proc_fs.h> 32 #include <linux/seq_file.h> 33 #endif 34 #ifdef CONFIG_ACPI_SYSFS_POWER 35 #include <linux/power_supply.h> 36 #endif 37 #include <acpi/acpi_bus.h> 38 #include <acpi/acpi_drivers.h> 39 40 #define ACPI_AC_COMPONENT 0x00020000 41 #define ACPI_AC_CLASS "ac_adapter" 42 #define ACPI_AC_DEVICE_NAME "AC Adapter" 43 #define ACPI_AC_FILE_STATE "state" 44 #define ACPI_AC_NOTIFY_STATUS 0x80 45 #define ACPI_AC_STATUS_OFFLINE 0x00 46 #define ACPI_AC_STATUS_ONLINE 0x01 47 #define ACPI_AC_STATUS_UNKNOWN 0xFF 48 49 #define _COMPONENT ACPI_AC_COMPONENT 50 ACPI_MODULE_NAME("ac"); 51 52 MODULE_AUTHOR("Paul Diefenbaugh"); 53 MODULE_DESCRIPTION("ACPI AC Adapter Driver"); 54 MODULE_LICENSE("GPL"); 55 56 #ifdef CONFIG_ACPI_PROCFS_POWER 57 extern struct proc_dir_entry *acpi_lock_ac_dir(void); 58 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir); 59 static int acpi_ac_open_fs(struct inode *inode, struct file *file); 60 #endif 61 62 static int acpi_ac_add(struct acpi_device *device); 63 static int acpi_ac_remove(struct acpi_device *device, int type); 64 static int acpi_ac_resume(struct acpi_device *device); 65 66 static const struct acpi_device_id ac_device_ids[] = { 67 {"ACPI0003", 0}, 68 {"", 0}, 69 }; 70 MODULE_DEVICE_TABLE(acpi, ac_device_ids); 71 72 static struct acpi_driver acpi_ac_driver = { 73 .name = "ac", 74 .class = ACPI_AC_CLASS, 75 .ids = ac_device_ids, 76 .ops = { 77 .add = acpi_ac_add, 78 .remove = acpi_ac_remove, 79 .resume = acpi_ac_resume, 80 }, 81 }; 82 83 struct acpi_ac { 84 #ifdef CONFIG_ACPI_SYSFS_POWER 85 struct power_supply charger; 86 #endif 87 struct acpi_device * device; 88 unsigned long long state; 89 }; 90 91 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger); 92 93 #ifdef CONFIG_ACPI_PROCFS_POWER 94 static const struct file_operations acpi_ac_fops = { 95 .owner = THIS_MODULE, 96 .open = acpi_ac_open_fs, 97 .read = seq_read, 98 .llseek = seq_lseek, 99 .release = single_release, 100 }; 101 #endif 102 #ifdef CONFIG_ACPI_SYSFS_POWER 103 static int get_ac_property(struct power_supply *psy, 104 enum power_supply_property psp, 105 union power_supply_propval *val) 106 { 107 struct acpi_ac *ac = to_acpi_ac(psy); 108 switch (psp) { 109 case POWER_SUPPLY_PROP_ONLINE: 110 val->intval = ac->state; 111 break; 112 default: 113 return -EINVAL; 114 } 115 return 0; 116 } 117 118 static enum power_supply_property ac_props[] = { 119 POWER_SUPPLY_PROP_ONLINE, 120 }; 121 #endif 122 /* -------------------------------------------------------------------------- 123 AC Adapter Management 124 -------------------------------------------------------------------------- */ 125 126 static int acpi_ac_get_state(struct acpi_ac *ac) 127 { 128 acpi_status status = AE_OK; 129 130 131 if (!ac) 132 return -EINVAL; 133 134 status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state); 135 if (ACPI_FAILURE(status)) { 136 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state")); 137 ac->state = ACPI_AC_STATUS_UNKNOWN; 138 return -ENODEV; 139 } 140 141 return 0; 142 } 143 144 #ifdef CONFIG_ACPI_PROCFS_POWER 145 /* -------------------------------------------------------------------------- 146 FS Interface (/proc) 147 -------------------------------------------------------------------------- */ 148 149 static struct proc_dir_entry *acpi_ac_dir; 150 151 static int acpi_ac_seq_show(struct seq_file *seq, void *offset) 152 { 153 struct acpi_ac *ac = seq->private; 154 155 156 if (!ac) 157 return 0; 158 159 if (acpi_ac_get_state(ac)) { 160 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n"); 161 return 0; 162 } 163 164 seq_puts(seq, "state: "); 165 switch (ac->state) { 166 case ACPI_AC_STATUS_OFFLINE: 167 seq_puts(seq, "off-line\n"); 168 break; 169 case ACPI_AC_STATUS_ONLINE: 170 seq_puts(seq, "on-line\n"); 171 break; 172 default: 173 seq_puts(seq, "unknown\n"); 174 break; 175 } 176 177 return 0; 178 } 179 180 static int acpi_ac_open_fs(struct inode *inode, struct file *file) 181 { 182 return single_open(file, acpi_ac_seq_show, PDE(inode)->data); 183 } 184 185 static int acpi_ac_add_fs(struct acpi_device *device) 186 { 187 struct proc_dir_entry *entry = NULL; 188 189 190 if (!acpi_device_dir(device)) { 191 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 192 acpi_ac_dir); 193 if (!acpi_device_dir(device)) 194 return -ENODEV; 195 acpi_device_dir(device)->owner = THIS_MODULE; 196 } 197 198 /* 'state' [R] */ 199 entry = proc_create_data(ACPI_AC_FILE_STATE, 200 S_IRUGO, acpi_device_dir(device), 201 &acpi_ac_fops, acpi_driver_data(device)); 202 if (!entry) 203 return -ENODEV; 204 return 0; 205 } 206 207 static int acpi_ac_remove_fs(struct acpi_device *device) 208 { 209 210 if (acpi_device_dir(device)) { 211 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device)); 212 213 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir); 214 acpi_device_dir(device) = NULL; 215 } 216 217 return 0; 218 } 219 #endif 220 221 /* -------------------------------------------------------------------------- 222 Driver Model 223 -------------------------------------------------------------------------- */ 224 225 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data) 226 { 227 struct acpi_ac *ac = data; 228 struct acpi_device *device = NULL; 229 230 231 if (!ac) 232 return; 233 234 device = ac->device; 235 switch (event) { 236 default: 237 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 238 "Unsupported event [0x%x]\n", event)); 239 case ACPI_AC_NOTIFY_STATUS: 240 case ACPI_NOTIFY_BUS_CHECK: 241 case ACPI_NOTIFY_DEVICE_CHECK: 242 acpi_ac_get_state(ac); 243 acpi_bus_generate_proc_event(device, event, (u32) ac->state); 244 acpi_bus_generate_netlink_event(device->pnp.device_class, 245 device->dev.bus_id, event, 246 (u32) ac->state); 247 #ifdef CONFIG_ACPI_SYSFS_POWER 248 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE); 249 #endif 250 } 251 252 return; 253 } 254 255 static int acpi_ac_add(struct acpi_device *device) 256 { 257 int result = 0; 258 acpi_status status = AE_OK; 259 struct acpi_ac *ac = NULL; 260 261 262 if (!device) 263 return -EINVAL; 264 265 ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL); 266 if (!ac) 267 return -ENOMEM; 268 269 ac->device = device; 270 strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME); 271 strcpy(acpi_device_class(device), ACPI_AC_CLASS); 272 device->driver_data = ac; 273 274 result = acpi_ac_get_state(ac); 275 if (result) 276 goto end; 277 278 #ifdef CONFIG_ACPI_PROCFS_POWER 279 result = acpi_ac_add_fs(device); 280 #endif 281 if (result) 282 goto end; 283 #ifdef CONFIG_ACPI_SYSFS_POWER 284 ac->charger.name = acpi_device_bid(device); 285 ac->charger.type = POWER_SUPPLY_TYPE_MAINS; 286 ac->charger.properties = ac_props; 287 ac->charger.num_properties = ARRAY_SIZE(ac_props); 288 ac->charger.get_property = get_ac_property; 289 power_supply_register(&ac->device->dev, &ac->charger); 290 #endif 291 status = acpi_install_notify_handler(device->handle, 292 ACPI_ALL_NOTIFY, acpi_ac_notify, 293 ac); 294 if (ACPI_FAILURE(status)) { 295 result = -ENODEV; 296 goto end; 297 } 298 299 printk(KERN_INFO PREFIX "%s [%s] (%s)\n", 300 acpi_device_name(device), acpi_device_bid(device), 301 ac->state ? "on-line" : "off-line"); 302 303 end: 304 if (result) { 305 #ifdef CONFIG_ACPI_PROCFS_POWER 306 acpi_ac_remove_fs(device); 307 #endif 308 kfree(ac); 309 } 310 311 return result; 312 } 313 314 static int acpi_ac_resume(struct acpi_device *device) 315 { 316 struct acpi_ac *ac; 317 unsigned old_state; 318 if (!device || !acpi_driver_data(device)) 319 return -EINVAL; 320 ac = acpi_driver_data(device); 321 old_state = ac->state; 322 if (acpi_ac_get_state(ac)) 323 return 0; 324 #ifdef CONFIG_ACPI_SYSFS_POWER 325 if (old_state != ac->state) 326 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE); 327 #endif 328 return 0; 329 } 330 331 static int acpi_ac_remove(struct acpi_device *device, int type) 332 { 333 acpi_status status = AE_OK; 334 struct acpi_ac *ac = NULL; 335 336 337 if (!device || !acpi_driver_data(device)) 338 return -EINVAL; 339 340 ac = acpi_driver_data(device); 341 342 status = acpi_remove_notify_handler(device->handle, 343 ACPI_ALL_NOTIFY, acpi_ac_notify); 344 #ifdef CONFIG_ACPI_SYSFS_POWER 345 if (ac->charger.dev) 346 power_supply_unregister(&ac->charger); 347 #endif 348 #ifdef CONFIG_ACPI_PROCFS_POWER 349 acpi_ac_remove_fs(device); 350 #endif 351 352 kfree(ac); 353 354 return 0; 355 } 356 357 static int __init acpi_ac_init(void) 358 { 359 int result; 360 361 if (acpi_disabled) 362 return -ENODEV; 363 364 #ifdef CONFIG_ACPI_PROCFS_POWER 365 acpi_ac_dir = acpi_lock_ac_dir(); 366 if (!acpi_ac_dir) 367 return -ENODEV; 368 #endif 369 370 result = acpi_bus_register_driver(&acpi_ac_driver); 371 if (result < 0) { 372 #ifdef CONFIG_ACPI_PROCFS_POWER 373 acpi_unlock_ac_dir(acpi_ac_dir); 374 #endif 375 return -ENODEV; 376 } 377 378 return 0; 379 } 380 381 static void __exit acpi_ac_exit(void) 382 { 383 384 acpi_bus_unregister_driver(&acpi_ac_driver); 385 386 #ifdef CONFIG_ACPI_PROCFS_POWER 387 acpi_unlock_ac_dir(acpi_ac_dir); 388 #endif 389 390 return; 391 } 392 393 module_init(acpi_ac_init); 394 module_exit(acpi_ac_exit); 395